摘要
采用X射线CT(computed tomography)成像仪对富油煤(长焰煤)进行了三维表征,建立了统计孔径分布(PSD)的等效孔隙网络模型(PNM),研究了压力梯度和流动方向对渗流过程的影响。结果表明:孔隙、矿物和基质分别占总体积的11.30%、1.03%和87.67%,连通孔隙率为5.13%。孔隙等效半径在3~8μm内的数量占89.23%,平均配位数为2.87,孔隙连通性较差。等效半径小于2μm的喉道数占73%,喉道的等效长度主要分布在10~30μm之间。在相同压力梯度下,三个方向的孔隙压力、渗流速度和流动路径分布不同,表现出各向异性。随着压力梯度的增大,渗流速度逐渐增大,且渗流速度随压力的变化呈现明显的非线性关系。三个方向上的调和平均渗透率为0.1403 mD,这与前人测得的榆神府矿区富油煤渗透率(0.1345 mD)相差在5%以内。
The three-dimensional characterization of tar-rich coal(long flame coal)was carried out by X-ray CT(computed tomography)imager.An equivalent pore network model(PNM)of the statistical pore size distribution(PSD)is established.The effects of pressure gradient and flow direction on the seepage process are studied.The results show that pores,minerals,and matrix account for 11.30%,1.03%and 87.67%of the total volume,respectively.The connected porosity is 5.13%.The number of pore equivalent radius within 3—8μm accounts for 89.23%.The corresponding average coordination number is 2.87,which indicates that the pore connectivity is poor.The number of throats with an equivalent radius less than 2μm accounts for 73%.The equivalent length of the throat is mainly distributed between 10—30μm.At the same pressure gradient,three directions of pore pressure,seepage velocity,and flow path distribution are different,showing anisotropy.With the increase of pressure gradient,the seepage velocity increases gradually.The seepage velocity shows an obvious nonlinear relationship with pressure.The harmonic average permeability in three directions is 0.1403 mD,which is close to the measured value(0.1345 mD)of another tar-rich coal in the Yushenfu mining area.The difference is within 5%.
作者
黄笑乐
杨甫
韩磊
宁星
李瑞宇
董凌霄
曹虎生
邓磊
车得福
HUANG Xiaole;YANG Fu;HAN Lei;NING Xing;LI Ruiyu;DONG Lingxiao;CAO Husheng;DENG Lei;CHE Defu(State Key Laboratory of Multiphase Flow in Power Engineering,Xi’an Jiaotong University,Xi’an 710049,Shaanxi,China;Shaanxi Provincial Coal Geology Group Co.,Ltd.,Xi’an 710026,Shaanxi,China;Key Laboratory of Coal Resources Exploration and Comprehensive Utilization,Ministry of Natural and Resources,Xi’an 710026,Shaanxi,China;Shunde Institute of Inspection,Guangdong Institute of Special Equipment Inspection and Research,Foshan 528300,Guangdong,China;Shaanxi No.185 Coalfield Geology Co.,Ltd.,Yulin 719000,Shaanxi,China)
出处
《化工学报》
EI
CSCD
北大核心
2022年第11期5078-5087,共10页
CIESC Journal
基金
华能集团总部科技课题能源安全技术专题项目(HNKJ20-H87)。
关键词
富油煤
多孔介质
X射线成像仪
三维表征
渗透率
数值模拟
tar-rich coal
porous media
X-ray imager
3D characterization
permeability
numerical simulation
作者简介
通信作者:邓磊(1983-),男,博士,副教授,leideng@mail.xjtu.edu.cn;第一作者:黄笑乐(1997-),男,博士研究生,1969912151@qq.com。
